What invention in the 17th century revolutionized mathematics by providing the first systematic link between Euclidean geometry and algebra, describing geometric shapes as algebraic equations involving the coordinates of the points lying on it?

Who is credited with the invention of the rotary internal combustion engine, introduced by NSU in their "Ro 80" in 1967 and used by Mazda in their "RX"models, the first of which, the RX-2, was introduced in 1970?